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Old 05-27-2022, 01:37 PM   #1
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Rear axle tires run hotter than front - normal?

On our new Micro Lite it came with the TST TMPS system. It shows the tires on the rear axle running about 10 degrees hotter than the front axle tires. Seems weird to me but you RVers with more experience would know. First TT with TPMS.
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Old 05-27-2022, 02:11 PM   #2
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Tire pressure the same in all 4 tires?

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Old 05-27-2022, 02:18 PM   #3
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Both my rights run hotter than lefts on my model. Others have reported the same.

So I think it's load distribution so unless it is a big difference, I wouldn't worry about it.
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Old 05-27-2022, 03:31 PM   #4
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Rear axle tires are “downstream” of the front set, so don’t get the cooling of fresh air. As asked in other reply are the tire pressures similar maybe slightly higher due to elevated temperature. Keep in mind if one side of trailer is in sunlight for minor side to side temperature difference. Might also check if you have too much take up on your WDH system
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Old 05-27-2022, 05:49 PM   #5
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Make sure your brakes are working on all 4 wheels. If you have a wire loose on one axle or one axle is less adjusted then the other it could cause one to be hotter due to brake heat.
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Old 05-30-2022, 08:05 AM   #6
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The TPMS temperature monitoring is iffy at best because what matters is the temperature of the rubber, not the air rising through the valve stem. It's best used for trend monitoring. In other words, if all tires are essentially behaving the same as the other tires and as they have always behaved then life is good.

Note that the direct sun shining on one side will raise the pressures and temps more than you might think. After a while you'll know that's what's doing it.

A much better method for temperature monitoring is to buy an infrared "gun" with a laser pointer. As soon as you stop, get out and "shoot" all of the wheels hubs. They cool down fast, which is why you need to do it as soon as you stop.

You'll soon learn what is normal for your RV. If you see a hub noticeably hotter than the others you may have a wheel bearing starting to fail or a brake dragging.

You don't need an expensive one, just one with a laser pointer, a Harbor Freight special or similar.

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Old 05-30-2022, 08:13 AM   #7
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Ten degrees = no problem. Fifty degrees = problem.
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Old 05-30-2022, 08:52 AM   #8
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axles not same temp

One other thing you could check when your hooked to your tow vehicle, park on a level spot, then check the level of your trailer. If your hitch is holding it higher in the front that will put more load on the rear axle. Try to be as close to level as possible, check tire pressure, and load distribution.
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